2011 shelby gt 5oo???

im having twin turbos put on with the factory supercharger by ford performance in Las angles and they want to put on methanol water injection with nitrous and ford says it will make around 1700 t0 2000 rwhp so im asking are they skewering me because that's nitrous,supercharger,twin turbos and methanol water injection so i don't know its gonna be boosted to 32 psi with every thing total is $10,230.27